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CVE-2026-94613— authentik: Denial of Service via Document Type Declarations in SAML Messages

Quick assessment

Affected
goauthentik authentik
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

authentik 是一款开源的身份提供商（Identity Provider）。在版本 2026.2.7、2026.5.7 和 2026.8.2 之前，未认证的攻击者可以向部署了 authentik 且配置为身份提供商（identity-provider）角色或 SAML 源（SAML source）角色的系统中提交格式错误的 SAML 消息。此类消息可能导致处理 或 路径的 worker 进程停止响应，从而使分配给该 worker 的请求失败。 尽管 worker 进程的终止和自动重启不会导致基于数据库的会话丢

CVSS 7.5 · High EPSS 0.64% · P49

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 3

VendorProduct Version RangeStatus
goauthentik authentik < 2026.2.7 affected
>= 2026.5.0, < 2026.5.7 affected
>= 2026.8.0, < 2026.8.2 affected
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I. Basic Information for CVE-2026-94613

Vulnerability Information
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Vulnerability Title
authentik: Denial of Service via Document Type Declarations in SAML Messages
Source: CVE Program / CVE List V5
Vulnerability Description
authentik is an open-source identity provider. Prior to 2026.2.7, 2026.5.7, and 2026.8.2, an unauthenticated attacker can submit a malformed SAML message to an authentik deployment using SAML in either the identity-provider or SAML source role. The message can stop the worker handling /application/saml/* or /source/saml/*, causing the requests assigned to that worker to fail. Worker process termination and automatic restart do not destroy database-backed sessions, but continued malicious messages can cause a sustained share of legitimate traffic to fail. Other protocol implementations are not affected. This issue is fixed in versions 2026.2.7, 2026.5.7, and 2026.8.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
goauthentik authentik < 2026.2.7 -

II. Public POCs for CVE-2026-94613

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III. Intelligence Information for CVE-2026-94613

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Patches & Fixes for CVE-2026-94613 (8)

Vendor Advisories for CVE-2026-94613 (2)

Vendor Pages for CVE-2026-94613 (4)

Same Patch Batch · goauthentik · 2026-09-24 · 5 CVEs total

CVE-2026-94606 8.9 HIGH authentik: MFA Bypass via State Confusion / Parameter Injection in AuthenticatorEmailStage
CVE-2026-94609 8.8 HIGH authentik: Privilege Escalation to Superuser via Group Hierarchy
CVE-2026-94611 8.1 HIGH authentik: Stored credentials are readable with view permission alone
CVE-2026-94612 7.4 HIGH authentik: Authentication bypass via assertion confusion in SAML sources

IV. Related Vulnerabilities

Same product: authentik
Same vendor: goauthentik
Same weakness: CWE-770

V. Comments for CVE-2026-94613

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